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tino4ka555 [31]
3 years ago
10

Help me ASAP

Biology
2 answers:
s2008m [1.1K]3 years ago
6 0

Explanation:

Once the myosin-binding sites are exposed, and if sufficient ATP is present, myosin binds to actin to begin cross-bridge cycling. Then the sarcomere shortens and the muscle contracts. In the absence of calcium, this binding does not occur, so the presence of free calcium is an important regulator of muscle contraction.

iogann1982 [59]3 years ago
3 0

Answer:

C, The myosin filaments remain in lace as they pull the actin filaments inward

Explanation:

Muscles contract when the heads on the myosin filaments latch onto the actin filaments, drawing them inward. As a result, the entire sarcomere shortens, resulting in a muscle contraction.

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You are examining the phylogenic relationship of a newly discovered plant species (Species 2). You amplify the RUBISCO barcode a
frozen [14]

Answer:

a. Inversion

b. Duplication

Explanation:

Inversion has the name suggest, has to do with a segment of DNA being reversed from end to end.

In this case here,

Inversion is taking place here.

species 1 ATGCAAATTTGGGCCCATGAATGGTTGCAA

species 2 ATGCAAAAATTTTGGTACGCCGAATGGTTGCAA

Therefore, the sequences in bold in species 1 are observed to be reversed end to end in species 2.

Deletion ❌❌

I am sure it's not feasible because deletion entails removal of a few sequences.

It can be seen that species 2 is longer than species 1, which gives another reason why deletion is not feasible too, as no sequences are seen to be deleted.

I believe duplication is feasible since AATT sequences are repeated once.

Our final answer,

inversion and duplication occur here.

4 0
3 years ago
What is d difference between epithelial cells and epidermal cells​
ASHA 777 [7]

<em>Answer:</em>

<em>It is the uppermost layer of the three layers of the skin. Summarily, the epithelium is a more general concept, and epidermis is the one type of epithelium, which is a more limited word indicating exterior part of the skin.</em>

<em />

<em>Explanation:</em>

<em>*Hope this helps*</em>

<em />

5 0
3 years ago
The earth's surface features are constantly changing in a process known as
maksim [4K]
The earth's surface features are constantly changing in a process known as weathering and erosion. Weathering would happen when rocks would break physically like frost shattering while erosion happens when sediments and rocks are moved from one place to another by agents like water, gravity, wind and ice. These two occurrences are the cause of the constant change of the Earth's surface.<span />
8 0
2 years ago
A cell membrane that transports glucose, ions, or other charged or polar molecules is likely to have a higher percentage and gre
erica [24]

Answer: True

Explanation:

<u>A cell membrane consists of a lipid bilayer made of polar phosphate head and a nonpolar lipid tail.</u> It is semipermeable and regulates the transport of materials through it. For this,<u> it is selectively permeable</u> and since it is made of lipids, hydrophobic and small polar molecules can diffuse easily through it by simple diffusion and down their concentration gradient. However, polar molecules, large molecules (such as glucose) and ions are not able to pass through it because they are repelled.

To accomplish the transport of these molecules that can not diffuse, proteins embebbed in the membrane function as carriers that enable the transport of polar molecules, large molecules and ions by passive (through facilitated diffusion, down its concentration gradient) or active transport (movement against its concentration gradient).

7 0
3 years ago
Which of the following is a true statement?
irakobra [83]

Answer:

I think true statement is A.

4 0
3 years ago
Read 2 more answers
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